Dark circle under the eyes maybe result of different factors. They can be heredity , stress , exposer to sun , fatigue , aging , irregular life style habits , etc.
As we age , we tend to develop dark circles under the eyes due to skin losing collagen . Eye ares is one of the most delicate areas of the body , will show singing of aging or stress in your people with dark circles.
Few health issues like sever dehydration , malnutrition , liver disease and hypothyroidism may
cause dark circles and hollows user the eye, by making changes in diet , taking supplements and
Vitamins , taking proper medicine for thyroid can help reduce dark circles.